There have been several such transitions in the past, but one of the largest and most dramatic transitions happened at the end of the last Ice Age. (scientificamerican.com)
There has never been a more dramatic transition from one Discovery generation to another than the arrival of the latest model in September 2016 (drivemag.com)
During the past 25,000 years, the Earth system has undergone a series of dramatic transitions. (britannica.com)